Knivens894
Well-Known Member
I watched a video on line intended to internally test hydraulic cylinders by plugging off the main hydraulic line on the back of the cylinder (main pressure face) and plugging the hydraulic line which serves it. Then with the machine running, the return control is actuated. If the cylinder extends under return pressure, then it indicates the internal seals are leaking excessively.
Is this procedure valid for use on the 490E?
I continue to have hydraulic overheating with this machine. About three years ago, I had all cylinders overhauled by the local CAT dealer's hydraulic shop. I know they did not use Deere factory seals, but rather substitutes. When I tested both the arm and bucket cylinders with this test they failed miserably.
I have ordered the Deere factory seal kits for these two cylinders. Could hydraulic cylinder internal blow by be adding to my hydraulic heat problem?
Thank you in advance for your thoughts in this regard.
Is this procedure valid for use on the 490E?
I continue to have hydraulic overheating with this machine. About three years ago, I had all cylinders overhauled by the local CAT dealer's hydraulic shop. I know they did not use Deere factory seals, but rather substitutes. When I tested both the arm and bucket cylinders with this test they failed miserably.
I have ordered the Deere factory seal kits for these two cylinders. Could hydraulic cylinder internal blow by be adding to my hydraulic heat problem?
Thank you in advance for your thoughts in this regard.